1728328 has 24 divisors (see below), whose sum is σ = 3770550. Its totient is φ = 740544.

The previous prime is 1728323. The next prime is 1728329. The reversal of 1728328 is 8238271.

It can be written as a sum of positive squares in only one way, i.e., 1695204 + 33124 = 1302^2 + 182^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1728328.

It is not an unprimeable number, because it can be changed into a prime (1728323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1813 + ... + 2596.

2^1728328 is an apocalyptic number.

It is an amenable number.

1728328 is an abundant number, since it is smaller than the sum of its proper divisors (2042222).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1728328 is a wasteful number, since it uses less digits than its factorization.

1728328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4429 (or 4418 counting only the distinct ones).

The product of its digits is 5376, while the sum is 31.

The square root of 1728328 is about 1314.6588911197. The cubic root of 1728328 is about 120.0075921122.

The spelling of 1728328 in words is "one million, seven hundred twenty-eight thousand, three hundred twenty-eight".